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<a name="1" href="#1">1</a>   <em class="jxr_javadoccomment">/**</em>
<a name="2" href="#2">2</a>   <em class="jxr_javadoccomment"> * Copyright 2010 Nicholas Blair, Eric Dalquist</em>
<a name="3" href="#3">3</a>   <em class="jxr_javadoccomment"> *</em>
<a name="4" href="#4">4</a>   <em class="jxr_javadoccomment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="5" href="#5">5</a>   <em class="jxr_javadoccomment"> * you may not use this file except in compliance with the License.</em>
<a name="6" href="#6">6</a>   <em class="jxr_javadoccomment"> * You may obtain a copy of the License at</em>
<a name="7" href="#7">7</a>   <em class="jxr_javadoccomment"> *</em>
<a name="8" href="#8">8</a>   <em class="jxr_javadoccomment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="9" href="#9">9</a>   <em class="jxr_javadoccomment"> *</em>
<a name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="11" href="#11">11</a>  <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
<a name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> * limitations under the License.</em>
<a name="15" href="#15">15</a>  <em class="jxr_javadoccomment"> */</em>
<a name="16" href="#16">16</a>  
<a name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> com.googlecode.ecache.annotations.key;
<a name="18" href="#18">18</a>  
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.io.Serializable;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Method;
<a name="21" href="#21">21</a>  
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> org.aopalliance.intercept.MethodInvocation;
<a name="23" href="#23">23</a>  
<a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> com.googlecode.ecache.annotations.util.Reflections;
<a name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> com.googlecode.ecache.annotations.utils.Objects;
<a name="26" href="#26">26</a>  
<a name="27" href="#27">27</a>  
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment">/**</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> * Generates the key for a cache entry using the hashCode of the intercepted</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * method and its arguments.</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * </em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * @author Alex Ruiz</em>
<a name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> */</em>
<a name="36" href="#36">36</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/googlecode/ecache/annotations/key/HashCodeCacheKeyGenerator.html">HashCodeCacheKeyGenerator</a> implements <a href="../../../../../com/googlecode/ecache/annotations/key/CacheKeyGenerator.html">CacheKeyGenerator</a> {
<a name="37" href="#37">37</a>  
<a name="38" href="#38">38</a>    <em class="jxr_javadoccomment">/**</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment">   * Flag that indicates if this generator should generate the hash code of the</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment">   * arguments passed to the method to apply caching to. If &lt;code&gt;false&lt;/code&gt;,</em>
<a name="41" href="#41">41</a>  <em class="jxr_javadoccomment">   * this generator uses the default hash code of the arguments.</em>
<a name="42" href="#42">42</a>  <em class="jxr_javadoccomment">   */</em>
<a name="43" href="#43">43</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> generateArgumentHashCode;
<a name="44" href="#44">44</a>  
<a name="45" href="#45">45</a>    <em class="jxr_javadoccomment">/**</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment">   * Construct a &lt;code&gt;HashCodeCacheKeyGenerator&lt;/code&gt;.</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">   */</em>
<a name="48" href="#48">48</a>    <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/ecache/annotations/key/HashCodeCacheKeyGenerator.html">HashCodeCacheKeyGenerator</a>() {
<a name="49" href="#49">49</a>      <strong class="jxr_keyword">super</strong>();
<a name="50" href="#50">50</a>    }
<a name="51" href="#51">51</a>  
<a name="52" href="#52">52</a>    <em class="jxr_javadoccomment">/**</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">   * Construct a &lt;code&gt;HashCodeCacheKeyGenerator&lt;/code&gt;.</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment">   * </em>
<a name="55" href="#55">55</a>  <em class="jxr_javadoccomment">   * @param generateArgumentHashCode</em>
<a name="56" href="#56">56</a>  <em class="jxr_javadoccomment">   *          the new value for the flag that indicates if this generator should</em>
<a name="57" href="#57">57</a>  <em class="jxr_javadoccomment">   *          generate the hash code of the arguments passed to the method to</em>
<a name="58" href="#58">58</a>  <em class="jxr_javadoccomment">   *          apply caching to. If &lt;code&gt;false&lt;/code&gt;, this generator uses</em>
<a name="59" href="#59">59</a>  <em class="jxr_javadoccomment">   *          the default hash code of the arguments.</em>
<a name="60" href="#60">60</a>  <em class="jxr_javadoccomment">   */</em>
<a name="61" href="#61">61</a>    <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/ecache/annotations/key/HashCodeCacheKeyGenerator.html">HashCodeCacheKeyGenerator</a>(<strong class="jxr_keyword">boolean</strong> generateArgumentHashCode) {
<a name="62" href="#62">62</a>      <strong class="jxr_keyword">this</strong>();
<a name="63" href="#63">63</a>      setGenerateArgumentHashCode(generateArgumentHashCode);
<a name="64" href="#64">64</a>    }
<a name="65" href="#65">65</a>  
<a name="66" href="#66">66</a>    <em class="jxr_javadoccomment">/**</em>
<a name="67" href="#67">67</a>  <em class="jxr_javadoccomment">   * @see CacheKeyGenerator#generateKey(MethodInvocation)</em>
<a name="68" href="#68">68</a>  <em class="jxr_javadoccomment">   */</em>
<a name="69" href="#69">69</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> Serializable generateKey(MethodInvocation methodInvocation) {
<a name="70" href="#70">70</a>      <a href="../../../../../com/googlecode/ecache/annotations/key/HashCodeCalculator.html">HashCodeCalculator</a> hashCodeCalculator = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/ecache/annotations/key/HashCodeCalculator.html">HashCodeCalculator</a>();
<a name="71" href="#71">71</a>  
<a name="72" href="#72">72</a>      Method method = methodInvocation.getMethod();
<a name="73" href="#73">73</a>      hashCodeCalculator.append(System.identityHashCode(method));
<a name="74" href="#74">74</a>  
<a name="75" href="#75">75</a>      Object[] methodArguments = methodInvocation.getArguments();
<a name="76" href="#76">76</a>      <strong class="jxr_keyword">if</strong> (methodArguments != <strong class="jxr_keyword">null</strong>) {
<a name="77" href="#77">77</a>        <strong class="jxr_keyword">int</strong> methodArgumentCount = methodArguments.length;
<a name="78" href="#78">78</a>  
<a name="79" href="#79">79</a>        <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; methodArgumentCount; i++) {
<a name="80" href="#80">80</a>          Object methodArgument = methodArguments[i];
<a name="81" href="#81">81</a>          <strong class="jxr_keyword">int</strong> hash = 0;
<a name="82" href="#82">82</a>  
<a name="83" href="#83">83</a>          <strong class="jxr_keyword">if</strong> (generateArgumentHashCode) {
<a name="84" href="#84">84</a>            hash = Reflections.reflectionHashCode(methodArgument);
<a name="85" href="#85">85</a>          } <strong class="jxr_keyword">else</strong> {
<a name="86" href="#86">86</a>            hash = Objects.nullSafeHashCode(methodArgument);
<a name="87" href="#87">87</a>          }
<a name="88" href="#88">88</a>  
<a name="89" href="#89">89</a>          hashCodeCalculator.append(hash);
<a name="90" href="#90">90</a>        }
<a name="91" href="#91">91</a>      }
<a name="92" href="#92">92</a>  
<a name="93" href="#93">93</a>      <strong class="jxr_keyword">long</strong> checkSum = hashCodeCalculator.getCheckSum();
<a name="94" href="#94">94</a>      <strong class="jxr_keyword">int</strong> hashCode = hashCodeCalculator.getHashCode();
<a name="95" href="#95">95</a>  
<a name="96" href="#96">96</a>      Serializable cacheKey = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/ecache/annotations/key/HashCodeCacheKey.html">HashCodeCacheKey</a>(checkSum, hashCode);
<a name="97" href="#97">97</a>      <strong class="jxr_keyword">return</strong> cacheKey;
<a name="98" href="#98">98</a>    }
<a name="99" href="#99">99</a>  
<a name="100" href="#100">100</a>   <em class="jxr_javadoccomment">/**</em>
<a name="101" href="#101">101</a> <em class="jxr_javadoccomment">   * Sets the flag that indicates if this generator should generate the hash</em>
<a name="102" href="#102">102</a> <em class="jxr_javadoccomment">   * code of the arguments passed to the method to apply caching to. If</em>
<a name="103" href="#103">103</a> <em class="jxr_javadoccomment">   * &lt;code&gt;false&lt;/code&gt;, this generator uses the default hash code of the</em>
<a name="104" href="#104">104</a> <em class="jxr_javadoccomment">   * arguments.</em>
<a name="105" href="#105">105</a> <em class="jxr_javadoccomment">   * </em>
<a name="106" href="#106">106</a> <em class="jxr_javadoccomment">   * @param newGenerateArgumentHashCode</em>
<a name="107" href="#107">107</a> <em class="jxr_javadoccomment">   *          the new value of the flag</em>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment">   */</em>
<a name="109" href="#109">109</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">void</strong> setGenerateArgumentHashCode(
<a name="110" href="#110">110</a>       <strong class="jxr_keyword">boolean</strong> newGenerateArgumentHashCode) {
<a name="111" href="#111">111</a>     generateArgumentHashCode = newGenerateArgumentHashCode;
<a name="112" href="#112">112</a>   }
<a name="113" href="#113">113</a> 
<a name="114" href="#114">114</a> }
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